However the observational evidence for AGN feedback remains elusive.
Indeed, AGN feedback has been reported to both enhance and suppress
star formation [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}.
One important reason for this uncertainty is that the lifetime of
AGN activities, which is about \(10^5\)  to \(10^8\)  years
[8]}, [9]}, [10]},
is much shorter than the quenching time scale[11]}, [12]},
so that it is difficult to find an instantaneous correlation
between AGN and star formation activities directly
from observational data.
